Clamp.



A. L. COBB.

CLAMP.

APPLICATION IILED MAY 1, 1911.

Patented Oct. 3, 1911.

entor Attorneys Witnesss UNITED srarns ra rnur orrion ALFRED L. COBB, OFESTES PARK, COLORADO, ASSIGNOR OF TWENTY-FOUR AND ONE- I-IALFONE-HUNDREDTHS T HOMER E. JAMES AND TWENTY-FOUR AND ONE-HALFONE-HUNDBEDTHS TO HOV/A313 P. JAMES, BOTH OF ESTES PARK, COLORADO.

CLAMP.

To all whom it may concern:

Be 1t known that I, ALFRED L. Conn, a citizen of the United States,residing at "Estes Park, in the county of Larimer and and claimed.

- is a side elevation of the clamp.

The object of the invention is to provide an extension clamp consistingof members arranged to telescope with relation to each other one of themembers being formed of strips of channel iron and provided at one endwith a post through which is threaded a thrust screw. The other memberis provided upon its inner side with strips adapted to slide in thechannels of the first mentioned member and the last mention-ed member isprovided with an adjustable bail stop and a pivoted bail which isadapted to engage in notches provided at the upper edge of the firstmentioned member.

In the accompanying drawings, Figure 1 Fig. 2 is a transverse sectionalview of the same cut on the line 2-2 of Fig. 1. Fig. 3 is a transversesectional view of the same cut on the line 33 of Fig. 1. Fig. 4 is atransverse sectional view of the same cut on the line 44 of Fig. 1. Fig.5 is a detail perspective view of the tail stock forming a part of theclamp.

The clamp includes an extensible bar made up of members 1 and 2 themember 1 being adapted to slide telescopically within the member 2. Themember 1 is made up of one or more strips of metal each provided in itsouter side with a longitudinally disposed channel 3. The intermediateportions of the said strips 1 fit one against the other and are securedby means of rivets 4: passed transversely through the said portions sothat the ends of the rivets are at the bottoms of the channels 3provided in the said strips. A post 5 is fitted over the stripsconstituting the member 1 at one end thereof and a thrust screw 6 isthreaded through the post and is provided at one end with a' channeledblock 7 and at its other end Wi h an operat- Specification of LettersPatent.

Application filed May 1, 1911.

Patented Oct. 3, 1911.

Serial No. 624,444.

ing handle pin 8. The strips which constitute the member 1 are providedat their upper edges with notches 9 which are inclined downwardly andaway from the post 5.

As hereinbefore stated the member 2 slidably receives the member 1 andthe said member 2 is provided upon the inner surfaces of its sideportions with strips 10 which are snugly received in the channels 3 ofthe member 1. A bail 11 is pivotally attached at its ends with the sideportions of the member 2 and the intermediate portion of the said bailis adapted to be received 1by the notches 9 provided upon the mem- Atail stock 12 is provided with a rectangular opening 13 which slidablyreceives the member 2 and the member 2 is provided at its upper portionwith notches 14:. The tail stock 12 is provided with a tongue 15 whichis adapted to enter the notches 1A and when so positioned the lowerportion of the tail stock 12 will bear against the lower side of themember 2 and thus the said stock will be locked in position upon themember 2 as illustrated in Fig. 1 of the drawings. The lower portion ofthe tail stock 12 is inclined or disposed toward the post 5 andconsequently any strain or pressure applied to that portion of the saidtail stock which is above the member 2 will have a tendency to morefirmly bind the said tail stock in a fixed position upon the member 2.

In operation the members 1 and 2 of the clamp are adjustedlongitudinally with relation to each other to effect major adjustmentand then the intermediate portion of the bail 11 is permitted to fall inone of the slots 9. This will hold the said members with relation toeach other. The tail stock 12 will then be adjusted along the member 2to effect minor adjustment and the work is inserted between thejournaled pin 7 and the upper portion of the tail stock 12 and the screw6 is tightened whereby the work is securely held between the said block7 and tail stock 12. By this arrangement it will be seen that a durable,strong and at the same time, light clamp structure is effected and thatthe parts may be easily and quickly adj usted to meet existingconditions.

By providing stop blocks 16 in the ends of the channel 3, the strips 10will move thereagainst and thus prevent the member 2 from beingwithdrawn from the member 1,

By referring to Fig. 1 it will be apparent that bail 11 is heldpositively in engagement with the member 1 by the engaged work, it thusbeing impossible for the bail to pull out of the notch as long as theclamp is in use.

Having described the invention what I claim as new and desire to secureby Letters Patent is A clamp including an extensible bar consisting oftelescopically connected members, registering notches extendingtransversely within the work engaging edges of said members, a bailpivotally connected to the outer member and shiftable into any one ofthe notches within the inner member, a post upstanding from one end ofthe inner memher, a clamping element carried thereby, a tail stockslidably and tiltably mounted upon and extending around the outer memberof the bar, and a tongue integral with said stock and shiftable into anyone of the notches in the outer member of the bar, said bail being heldin engagement with the notched inner member by the engaged work.

In testimony that I claim the foregoing as my own, I have heretoforeaflixed my signature in the presence of two witnesses.

ALFRED L. COBB.

Witnesses:

W. T. PARKE, R. H. TALLANT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G. i

